Telegraph system.



JOHN M. FELL, OF HACKENSACK, NEW

JERSEY. ASSIGNOR TO AMERICAN TELEPHONE AND TELEGRAPH COMPANY, .A CORPORATION OF NEW YORK.

TELEGRAPH SYSTEM.

Specification of Letters Patent.

Patented Aug. 21. 1917.

Application led July 8, 1916. Serai No. 103,393.

To all Awhom t may concern:

Be it known that I, JOHN M. FELL, residing at-llackensack, in the county of Bergen and State of New Jersey, have. invented een tain Improvements in Telegraph Systems,

of which the following is a specification.

ln operating telegraph systems by the half-duplex method, in which duplex apparatus is employed to give one-Way transmission between a main line circuit and extension lines or substation loops, it is sometimes difficult for the receiving operator to send promptly a break signal to the sending operator when it is desired to stop transmission. This may occur at a time when the operator is sending a series of rapidly ren curring dots, because as the receiving oper ator opens his key to break, the pole changer which transmits the break signal Wili be energized by its locking circuit through the contact of the repeating sounder which has been released by the opening of the key of the sending operator. The break signal Will thus be delayed until the sending key has been again closed, but in the meantime the breaking operator may have begun to send and the first signaling impulses wiii he iost. I avoid this difficulty and obtain a prompt break, by providing means for removing the pole changer from the control of the sending operator throu h the repeating sounder by opening the loc ing circuit for said pole changer.

It 1s also possible with a halfduplex arrangement for the operators to lose control of the apparatus by simultaneously opening their keys. Suppose a receiving operator attempts to break just as'the sendin operator is transmittin a space. This will cause the release o all the receiving and transmitting apparatus at both ends ot the line, and, since the circuits inf-hiding the keys and windings of the pole changers are through the break contacts of the receiving a paratus, in absence of special means for t is purpose neither operator can actuate the pole changer to resume transmission. To meet these conditions T furnish a substitute circuit for the normal circuit governing each pole changer, thus preventing auch loss of control.

'In outlining the invention above and hercinafter describing it, particular systems and ratus are referred to. lt is to he nnderstoofl, however, that the invention is to be considered as limited in these respects only as defined in the claims.

The drawing shows diagrammatically. connected telegraph. stations organized in accordance, with one embodiment of my invention.

Telegraph central stations appear at X and Y, these being joined by a main line L. These stations are arranged to repeat respectively between the main line and loops or extensions Lx and LY icading to substr tions m and y. I have chosen to illustrate this as accomplished by the differential dan plex method.` there being at each of the stations X and Y a relay R poiarized by a winding 10 included in a battery circuit 11 and having differential windings 1Q, 12 connected to the main line L and artificial line L', and also, in the customary manner, to the common. conductor 13 leading to the armature of the pole changer T. onsidering the equipment at one extremity only of theline, that at the opposite end being identical with it, the armature 14 of relay R through its contacts 15 and 16 applies a negative and a positive battery B and B1 to the polarized repeating sounder line relay and repeating sounder furnish respectively primary and seconda receiving apparatus. An auxiliary contro ling Winding 17 of the relay R is also connected to the `armature and has itsy opposite extremity grounded through a condenser C and the winding of sounder S.

The substation loop normallyY passes S. The

through a key or primary transmitting apparatus T, the winding of a neutral relay R', associated with the front contactof which is a iocal sounder circuit l, the contart 18 of sounder S, the winding of the Hole change-r or 'secondary transmitting appara-- tul "I" and key 'il' of the central station attendant to battexy B2. Negative and positive batteries B and B* are joined to confacts 19 and 20 of the pole chan er. From the common wire 13 is connecter to ground a polarized sounder S', which actuated by outgoing impulses from the amature of the pole changer permita the attendant to monitor this portion of the service. From the contact 21 ot' the repeating sounder S con nei-tion is made to gronnf by way of the contact QQiof monitoring Sounder S'. Ther contact :'23 of sounder S is united at '24 to the normal loop circuit between the key 2. In a telegraph system, riccivingiappa-4 rates, local transmitting apparatus normally 'for removing the latter apparatus controlled hy the receiving apparatiisa.nil

an clcctrlnechanisin governed iy operating currents from siiiil transmitting apparatus rom the control of thc ri-,eeivinp apparatus.

3. In a telegraph system, a lineI circuit,

,-reoeiving apparatus iissixiatail therewith, ltransmittingapparatus normally controlled .by the renewing apparatus, uuil rleetroniag- A netic malins joiiieiltii the lim'. cirruit for iemoving the transmitting apparatus from vthc control of said receiving apparatus.

4. In a telegraph system, riweiving apparatus, transmitting apparatus, a circuit for the transmitting apparatus passing thmiigh contacts 0f the receiving apparatus, other 4contacts in said circuit, aiul `nii-.ans responsive to operating current from the transmittin apparatus forop'emng the circuit at the -nameil contacts. l

5. In a half-duph-.is telegraph systcin, ii.

liuc circuit, a receiving apparatus and a transmitting apparntnsassociated therewith,

- a secondary receiving apparatus controlled by the line receiving' apparatus, au extension circuit passing through the smoiidarylissieiving apparatus and thc transmitting appa,- rc. is, and un electro-moc!iansm energized by current from the lino circuit anil governing the extension circuit.

(i. ln a half-duplux telegraph system, a` line circuit, al rereiving apparatus and a transmitting apparatus associated therewith, n. secondary receiving apparatus controlled by the line receiving apparatus, an extension circuit jmssiug throu ariitus, and an electro-mechanism joined to ghe line .circuit between the receiving apparatus and transmitting apparatus und govornin the extension circuit.

7. n a halfhiplex telegraph sysi'ein, a line relay, a pole changer, Illa common conductor joining thc line rela and polo china gena repeating sounder un er thel influence' ofthe line rela. en cxtonsion circuit pinning throii h a con ict of the repeating sounder and t c winding of the pole changer, a locking circuit for the pole changer controlled hy tho reptuiting sounder, and a monitoring sounder connected to the comn'ion conductor and also contrnllin the locking circuiti 8. In half-dup ex telegraph system, a lino relay, a pole changer, a common conductor joining am 1in@ any and paie change,

a repeating sounder under the influence and the windiii -o the line relay, an extension circuit passing through 'a contact f the repeating sounder of thecpolc changer, a locking circuit for polo anger oontrolledby the repeating sounder, an e monitoring sounder connected to the common conductor and acting to open the locking circuit.

the secondary re-v .ceiving apparatus am the transunttmg,g apother circuit between tlio transmitting .np-`

iaratus when thc lirstnamcil circuit is irokcn. r f

ll. .ln a telegraph s'ysleni, riaiciving apparatus, primary transmitling apparatus, soromlary transmitting apparatus controlled (hei-olii", a'circiiit iamnccting the primary auil secondary tramsinitting.:l apparatus through a contact of the mamiving aiparatas, and ini-ans maler the conti-ol o the triiusinittiu1.;V apparatus for establishing am other circuit. lxitween the transmitting ap pariitus through another mnt'act of the re ceiving apparatus when the limit-.named cir'- 'cnit is lirocen. i

.12. In a tn lcgniph system, receiving appa# rains, primary transmitting apparatus, sec.- ouilary' transmitting ap|`iaratus Vcontrolled therol'iy, a circuit connecting the primary and secondary transmitting apparatus through acontact of the receiving u para# tus,and an clcctro-mechauisincontro ed bj'- the transmitting apiuratus for establishing another .circuit ietwecn the transinit` lirst-named circuit ting` apparatus when-tho is hrolccn. 1 i

13. 'lhe combination with a line circuit nml an extension circuit, `pi. rcccivin apparatus connecting said circuits, plura transmitting apparatus in the extension circuit,

anclectro-mechanisin joined to the lincicircuit, aiul n circuit throuI h one of the trimsmittng apparatus su tuted. forthe normal extension circuit and controlled by said electrmcchanism.

14. The combination with a line circuit' and an extcnsioncircuit, of recciviu appa'- `ratas connecting said circuits, xplura trans initting apparatus in the extonsion circuit,

im electrmcchanism under the influence of the transmitting apparatus, and a circuit .through one of the transmitting apparatus substituted for a normal extension circuit and closed by said electro-mechanism upon the release f the transmitting u baratas.4

` 1 The combination with c. ineicircut and an' eztensioncirouit, of reecivirlili,L appa.-

transmittng apparatus in the extension circuit un eiectroduechunsm under the influence o the trensntting apparat and e circuit through one of the transmi f upparatim 6 substitutedor a normal extension clreuit und closed by seid upon the release of the transmxttlng apparatus und receiving 1G." In a hal uplex telggraph. system, at line crclt, prixnnry receiving eppurghxs assocnted" therewith, secondary receiving nppnratus controlled by u pgratu .an' extension passing lrough e secqnqary reeclvmg appnrutus; pruning-'transmitting apparatus n the extension eireult, secondary puntus meinung tbe extention en inne emxlg, und n path the primary :und eecondu trmsmittlngappar'atus substitud' for normal circuitupon therelense of the receiving und tranmiitting appumtlllt` 17. In im nu line circ pnmfiry reeelvmg ap .us associated' therewith i uppurutus' controlled, by. the. une receiving np mutue, an extension u'omt seing tludug i' the aemudaxy reeexvlngapparatus, primary transmitting apparatus 1.nthe exf tuls'ou circuit, uewudmy 'trunlmttm apeircuitil.' uvputh between the priln'nl'y -socondur'y trunsufttiug uppnrntim substr tuud for the nox-null circuit' upon the -re'- lense df. the receiving and' trnnsmittmg aptlie line receivung' half-iuplex telegraph system, ul

mesma params, und means connwm tu me line cir- .eratona'keyintheextunsxon circuiuapoe having its winding in' the extension circuit and its contacts eonneted to the line circuit, a momtorng soundr connected to the line circu and e substitute circuit for tlhey and po e changer ntrolled by cun' tnets of the monitoring der.

a hnlf-duplex regl-:xph system, n 5o lune circuit, a' relny V ted therewith, a n sounder continued by the line re Alily, an 'extem'sim circuit' passing through; o f-the repeuting' wunder, un oJ- eratora hey intie'extenmoncrcxt, a. poe 56 chungerhav' 'its winding. in the extem sicu circuit un '/ts eontnetc'connected w-the line eircuit, av ionitorngisounler connected to the line 'cu and a` substitute circuit iorthekey dpdlechun'gercontrolledby 60 contacts of the munita-ing' and repeating m1: mum hereof 1 1m sigma n w ve :n nume to thillecaiiplljintiie reeence n two lubsribng witness, this rst day of 66 July, 1916.

JOHN M. FELL.

f Witnesaes:

Ew. F. Wurzen,

B. Pinar Hnzmmn.' 

